kopia lustrzana https://github.com/f4exb/sdrangel
126 wiersze
3.4 KiB
C++
126 wiersze
3.4 KiB
C++
#include "dsp/spectrumvis.h"
|
|
#include "gui/glspectrum.h"
|
|
#include "dsp/dspcommands.h"
|
|
#include "util/messagequeue.h"
|
|
|
|
#define MAX_FFT_SIZE 4096
|
|
|
|
#ifdef _WIN32
|
|
double log2f(double n)
|
|
{
|
|
return log(n) / log(2.0);
|
|
}
|
|
#endif
|
|
|
|
SpectrumVis::SpectrumVis(GLSpectrum* glSpectrum) :
|
|
SampleSink(),
|
|
m_fft(FFTEngine::create()),
|
|
m_fftBuffer(MAX_FFT_SIZE),
|
|
m_logPowerSpectrum(MAX_FFT_SIZE),
|
|
m_fftBufferFill(0),
|
|
m_glSpectrum(glSpectrum)
|
|
{
|
|
handleConfigure(1024, 10, FFTWindow::BlackmanHarris);
|
|
}
|
|
|
|
SpectrumVis::~SpectrumVis()
|
|
{
|
|
delete m_fft;
|
|
}
|
|
|
|
void SpectrumVis::configure(MessageQueue* msgQueue, int fftSize, int overlapPercent, FFTWindow::Function window)
|
|
{
|
|
Message* cmd = DSPConfigureSpectrumVis::create(fftSize, overlapPercent, window);
|
|
cmd->submit(msgQueue, this);
|
|
}
|
|
|
|
void SpectrumVis::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst)
|
|
{
|
|
// if no visualisation is set, send the samples to /dev/null
|
|
if(m_glSpectrum == NULL)
|
|
return;
|
|
|
|
while(begin < end) {
|
|
size_t todo = end - begin;
|
|
size_t samplesNeeded = m_refillSize - m_fftBufferFill;
|
|
|
|
if(todo >= samplesNeeded) {
|
|
// fill up the buffer
|
|
std::vector<Complex>::iterator it = m_fftBuffer.begin() + m_fftBufferFill;
|
|
for(size_t i = 0; i < samplesNeeded; ++i, ++begin)
|
|
*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
|
|
|
|
// apply fft window (and copy from m_fftBuffer to m_fftIn)
|
|
m_window.apply(&m_fftBuffer[0], m_fft->in());
|
|
|
|
// calculate FFT
|
|
m_fft->transform();
|
|
|
|
// extract power spectrum and reorder buckets
|
|
Real ofs = 20.0f * log10f(1.0f / m_fftSize);
|
|
Real mult = (10.0f / log2f(10.0f));
|
|
const Complex* fftOut = m_fft->out();
|
|
for(size_t i = 0; i < m_fftSize; i++) {
|
|
Complex c = fftOut[((i + (m_fftSize >> 1)) & (m_fftSize - 1))];
|
|
Real v = c.real() * c.real() + c.imag() * c.imag();
|
|
v = mult * log2f(v) + ofs;
|
|
m_logPowerSpectrum[i] = v;
|
|
}
|
|
|
|
// send new data to visualisation
|
|
m_glSpectrum->newSpectrum(m_logPowerSpectrum, m_fftSize);
|
|
|
|
// advance buffer respecting the fft overlap factor
|
|
std::copy(m_fftBuffer.begin() + m_refillSize, m_fftBuffer.end(), m_fftBuffer.begin());
|
|
|
|
// start over
|
|
m_fftBufferFill = m_overlapSize;
|
|
} else {
|
|
// not enough samples for FFT - just fill in new data and return
|
|
for(std::vector<Complex>::iterator it = m_fftBuffer.begin() + m_fftBufferFill; begin < end; ++begin)
|
|
*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
|
|
m_fftBufferFill += todo;
|
|
}
|
|
}
|
|
}
|
|
|
|
void SpectrumVis::start()
|
|
{
|
|
}
|
|
|
|
void SpectrumVis::stop()
|
|
{
|
|
}
|
|
|
|
bool SpectrumVis::handleMessage(Message* message)
|
|
{
|
|
if(DSPConfigureSpectrumVis::match(message)) {
|
|
DSPConfigureSpectrumVis* conf = (DSPConfigureSpectrumVis*)message;
|
|
handleConfigure(conf->getFFTSize(), conf->getOverlapPercent(), conf->getWindow());
|
|
message->completed();
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void SpectrumVis::handleConfigure(int fftSize, int overlapPercent, FFTWindow::Function window)
|
|
{
|
|
if(fftSize > MAX_FFT_SIZE)
|
|
fftSize = MAX_FFT_SIZE;
|
|
else if(fftSize < 64)
|
|
fftSize = 64;
|
|
if(overlapPercent > 100)
|
|
m_overlapPercent = 100;
|
|
else if(overlapPercent < 0)
|
|
m_overlapPercent = 0;
|
|
|
|
m_fftSize = fftSize;
|
|
m_overlapPercent = overlapPercent;
|
|
m_fft->configure(m_fftSize, false);
|
|
m_window.create(window, m_fftSize);
|
|
m_overlapSize = (m_fftSize * m_overlapPercent) / 100;
|
|
m_refillSize = m_fftSize - m_overlapSize;
|
|
m_fftBufferFill = m_overlapSize;
|
|
}
|